Automobile lift



Noy. 2, 1937,

c. J. BRISTOL AUTOMOBILE LIFT Fil ed March 1, 1937 III Patented Nov. 2,1937 than STATES AUTOMOBILE LIFT Cyrus J. Bristol, Des Moines, Iowa,assignor to Globe Hoist Company, Des Moines, Iowa, a

corporation of Iowa Application March 1,

2 Claims.

My invention relates to that class of automobile lifts in which anupright cylinder is provided and a plunger therein is raised and loweredby fluid pressure. In hoists of this kind it is nec- 5 essary to have aplunger bearing at the top of the cylinder, and also a second bearingspaced below the first to prevent lateral movement of the upper end ofthe plunger when elevated, and lifts of this class were usually providedwith means for positively limiting the upward movement of the plunger,and such means were necessarily located in the space between the plungerand cylinder and, hence, were not readily accessible, and considerabletime and effort were required to remove the plunger from the cylinder.

The object of my invention is to provide means of simple, durable andinexpensive construction for readily, quickly and easily removing orreplacing the plunger and also positively limiting the upward movementof the plunger.

Referring to the accompanying drawing, Figure 1 shows a vertical centralsectional View through a part of an automobile hoist mechanism embodyingmy invention.

25 Figure 2 shows a transverse sectional view on the line 2--2 of Figure1.

Figure 3 shows a detail vertical central sectional view illustrating thelower portion of the plunger and cylinder, and illustrating the stoparms in their withdrawn position; and

Figure 4 shows a sectional view on the line d- I of Figure 1.

The reference numeral I indicates an upright cylinder of ordinaryconstruction open at its upper end and closed at its lower end. At theupper end of the cylinder there is fixed a plunger bearing II, and at apoint spaced below the bearing I I is a combined plunger bearing andstop member I2 firmly fixed in position on the cylinder by rivets or thelike. This bearing member and stop is preferably formed with passagewaysI3 so that fluid may freely move up and down past it.

Slidingly mounted within the cylinder is a cylindrical plunger I I openat its top and having a plunger head I5 fixed in position spaced aboveits lower end, and in this lower end of the plunger which extends belowthe head is a series of openings I6, for purposes hereinafter madeclear. A screw-threaded rod I1 is rotatably mounted in an uprightposition in the plunger head I5, and it is provided at its upper endwith an enlarged head I 8, and between the head I 8 and the plunger headI 5 is a washer I9. Mounted on the lower end of the screw-threaded rod II is a nut 20, and pivoted to this nut are four arms 2| extended 1937,Serial No. 128411 (Cl. 254-93 outwardly through the openings I6 in theplunger. The head I8 is provided with a transverse slot 22, or the like,adapting it to be engaged for turning by an ordinary wrench or likeimplement, and this may be done by inserting the implement through theopen top of the plunger.

In practical use the plunger bearing and stop member I2 is riveted orotherwise firmly fixed in position. When it is desired to insert theplunger the nut is moved to the position shown in Figure 3, so that thearms 2| are withdrawn, thereby permitting the plunger to be readily andeasily inserted within the cylinder past both of the bearings therein.When this has been done the operator inserts a wrench or the likethrough 15 the open upper end of the plunger and engages the head I8 androtates it until the nut 20 firmly engages the under surface of theplunger head I5, and when this is done a, fluid-tight joint is providedat the point where the screw-threaded rod passes through the plungerhead. At the same time the arms 2| are caused to project outwardlybeyond the plunger, and they are firmly held in this position.Obviously, when fiuid pressure is applied within the cylinder theplunger will be elevated, and when the arms 2| reach the stop device I2,the upward limit of the plunger will be stopped and the plunger willhave two spaced apart bearings for firmly holding it against lateralmovement when in its maximum elevated position.

In practice I have found that a very substantial saving in the originalcost of this part of the lift device may be effected by means of myimprovement, and a very substantial saving in both time and labor iseilected when it is desired for any reason to remove and replace theplunger.

I claim as my invention:

1. In a hoist, the combination of an upright cylinder open at its upperend, a plunger slidingly mounted in the cylinder and open at its upperend and provided with a lower head spaced above the lower end of thecylinder, the projecting lower end of the plunger being formed withguide openings, two plunger bearings fixed to the cylinder, one at itsupper end portion and the other spaced below the first, a screw-threadedrod extended through and rotatably mounted in said piston head, havingits upper end shaped to re- 50 ceive an implement for rotating the rod,a nut mounted on the rod below the piston head and arms pivoted to thenut and extended through the openings in the lower end of the plunger,said arms being so shaped that when the nut is at its upper limit theouter ends of the arms will project beyond the plunger and co-operatewith 'the lower bearing on the cylinder to limit the upinder, one at itsupper end portion and the other spaced below the first, a screw-threadedrod ex-' tended through and rotatably mounted in said piston head,having its upper end shaped to receive an implement for rotating therod, a nut mounted on the rod below the piston head and arms pivoted tothe nut and extended through the openings in the lower end of theplunger, said arms being so shaped that when the nut is at its upperlimit the outer ends of the arms will project beyond the plunger andco-operate with the lower bearing on the cylinder to limit the upwardmovement of the plunger, and when the nut is at its lower limit, theouter ends of said arms will be withdrawn to permit the removal of theplunger from the cylinder, said screw-threaded rod having a head at itsupper end and a washer between said head and the upper surface of thepiston head, and whereby when the screwthreaded rod is at its lowerlimit of movement fluid from the interior of the cylinder will beprevented from entering the plunger.

CYRUS J. BRISTOL.

